Bose-Einstein condensate in a double-well potential as an open quantum system

Details Bose-Einstein condensate in a double-well potential as an open quantum system Bose-Einstein condensate in a double-well potential as an open quantum system

1998-03-25

arxiv.org/abs/cond-mat/9803298v1

Phys. Rev. A 58 (1998) R50

Physics

Condensed Matter

4 pages, RevTex, 5 postscript figures

Scientific paper

10.1103/PhysRevA.58.R50

We study the dynamics of a Bose-Einstein condensate in a double-well potential in the two-mode approximation. The dissipation of energy from the condensate is described by the coupling to a thermal reservoir of non-condensate modes. As a consequence of the coupling the self-locked population imbalance in the macroscopic quantum self-trapping decays away. We show that a coherent state predicted by spontaneous symmetry breaking is not robust and decoheres rapidly into a statistical mixture due to the interactions between condensate and non-condensate atoms. However, via stochastic simulations we find that with a sufficiently fast measurement rate of the relative phase between the two wells the matter wave coherence is established even in the presence of the decoherence.

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